If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is \( \mathrm{sp}^...

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If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is \( \mathrm{sp}^{3} \) hybridised, what fraction of voids are occupied by carbon atom?
(a) \( 25 \% \) Tetrahedral
(b) \( 50 \% \) Tetrahedral
(c) \( 25 \% \) Octahedral
(d) \( 50 \% \) Octahedral
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